I think you want parameterize: (parameterize ([date-display-format 'rfc2822]) (date->string i #t))
In general: ((lambda () e1 e2 ...)) = (begin e1 e2 ...) fwiw. So that extra function there isn't going to help. Robby On Sun, Jan 8, 2012 at 2:23 PM, Jordan Schatz <jor...@noionlabs.com> wrote: > This code runs, but I'm guessing that its not the "right way" to do it. > > (define (js-date [i (current-date)]) > (let ([original-format (date-display-format)] > [return ((λ () > (date-display-format 'rfc2822) > (date->string i #t)))]) > (date-display-format original-format) > return)) > > 1) In "some other language" using a function as the default value for an > argument is inefficient and frowned upon. Is that the case in racket? > > 2) I want to set the date-format back to whatever it was before the > function ran, so (date-display-format original-format) seems like it > should go last, but I need my return value... What I have looks hacky, > whats the "correct" way to do it? > > Thanks! > Jordan > ____________________ > Racket Users list: > http://lists.racket-lang.org/users ____________________ Racket Users list: http://lists.racket-lang.org/users
